Conda env for SWM

Login to derecho
```
module load conda
conda create -n py38 python=3.8
conda activate py38
conda install numpy
```

gt4py example instructions
```
python3.8 -m venv venv
source venv/bin/activate
git clone git@github.com:ai2cm/shallow_water_demo.git && cd shallow_water_demo
pip install -e "./[plot]"
```
